MI SB1136

Prohibits excessive pricing for gasoline, propane, and home heating oil during market disruptions, defined as any sudden market change caused by weather, supply disruptions, emergencies, or other abnormal conditions.

Defines "excessively increased price" as any price increase exceeding 20% compared to pre-disruption prices, unless the seller can prove the increase reflects higher costs or an extraordinary pre-disruption discount.

Authorizes the Attorney General to bring class action lawsuits for actual damages or $100 per person (whichever is greater) and empowers prosecutors to investigate violations through compulsory testimony and document production.

Establishes civil penalties up to $10,000 per violation for individuals and $1,000,000 per violation for other entities, with potential treble damages if violations are flagrant.

Makes knowing violations a misdemeanor punishable by up to 1 year imprisonment and/or $10,000 fine for individuals, or up to $1,000,000 fine for non-individual entities.